I learned "MUSHIN" from
Sensei Kaplan in one beach workout in Hawaii about three years ago. He said,"MUSHIN
means if you want to wake up, you just wake up without thinking about waking up itself or
lying on the bed anymore; if you want to read a book and study, you just open the book and
study it without thinking of other things or not to study. But that doesn't mean you just
do everything without plan. Instead, you plan ahead carefully and be loyal to and stick
with what have planed with MUSHIN." To paraphrase Kyoshi, "Just do it"
means "Just MUSHIN."

"MU-" is actually
translated from Kanji (Chinese character) which means No, nothing, empty.
"-SHIN" also means from Kanji the heart. Yes, the heart! Ancient Chinese
believed our mind or cognition is from our hearts. Even now, Chinese people still say in
Chinese "You are doing it with no heart." That means you are doing it
uncarefully and carelessly. Therefore, MUSHIN can be translated literally as NO
HEART! Of course, I am not saying we should do things with no care but abide by the spirit
beyond the literal meaning of this word, "MUSHIN."